Add support to dump font cache texture for debug purposes

src/gpu/GrTextStrike.cpp

 /*
  * Copyright 2010 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrAtlas.h"
 #include "GrGpu.h"
 #include "GrRectanizer.h"
 #include "GrTextStrike.h"
 #include "GrTextStrike_impl.h"
+#include "SkString.h"
 
 SK_DEFINE_INST_COUNT(GrFontScaler)
 SK_DEFINE_INST_COUNT(GrKey)
 
 ///////////////////////////////////////////////////////////////////////////////
 
 #define FONT_CACHE_STATS 0
 #if FONT_CACHE_STATS
 static int g_PurgeCount = 0;
 #endif
@@ skipping 140 matching lines @@
     count2 = 0;
     strike = fTail;
     while (strike) {
         count2 += 1;
         strike = strike->fPrev;
     }
     SkASSERT(count == count2);
 }
 #endif
 
+#ifdef SK_DEVELOPER
+void GrFontCache::dump() const {
+    static int gDumpCount = 0;
+    for (int i = 0; i < kMaskFormatCount; ++i) {
+        if (NULL != fAtlasMgr[i]) {
+            GrTexture* texture = fAtlasMgr[i]->getTexture();
+            if (NULL != texture) {
+                SkString filename;
+                filename.printf("fontcache_%d%d.png", gDumpCount, i);
+                texture->savePixels(filename.c_str());
+            }
+        }
+    }
+    ++gDumpCount;
+}
+#endif
+
 ///////////////////////////////////////////////////////////////////////////////
 
 #ifdef SK_DEBUG
     static int gCounter;
 #endif
 
 /*
     The text strike is specific to a given font/style/matrix setup, which is
     represented by the GrHostFontScaler object we are given in getGlyph().
 
@@ skipping 87 matching lines @@
                                          glyph->height(), storage.get(),
                                          &glyph->fAtlasLocation);
     if (NULL == plot) {
         return false;
     }
 
     glyph->fPlot = plot;
     plot->setDrawToken(currentDrawToken);
     return true;
 }